| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:06.36 | 2025 Age Group International SC | 2025-11-27 |
| 100m Breaststroke | 1:10.20 | MAC Winter Invitational | 2026-01-22 |
| 100m Breaststroke | 1:10.31 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 100m Butterfly | 1:05.46 | 2025 Age Group International SC | 2025-11-27 |
| 100m Freestyle | 57.77 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 100m IM | 1:05.43 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 1500m Freestyle | 16:37.52 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 200m Backstroke | 2:20.69 | 2025 Age Group International SC | 2025-11-27 |
| 200m Breaststroke | 2:34.21 | MAC Winter Invitational | 2026-01-22 |
| 200m Breaststroke | 2:30.04 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 200m Butterfly | 2:25.91 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 200m Butterfly | 2:22.32 | 2025 Age Group International SC | 2025-11-27 |
| 200m Freestyle | 2:08.44 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 200m Freestyle | 1:59.75 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 200m IM | 2:23.29 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 200m IM | 2:19.00 | 2025 Age Group International SC | 2025-11-27 |
| 400m Freestyle | 4:25.94 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 400m Freestyle | 4:15.79 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 400m IM | 4:56.66 | MAC Winter Invitational | 2026-01-22 |
| 400m IM | 4:49.13 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Backstroke | 31.47 | Hall of Fame | 2025-10-18 |
| 50m Breaststroke | 31.31 | MAC Winter Invitational | 2026-01-22 |
| 50m Breaststroke | 31.99 | 2025 Age Group International SC | 2025-11-27 |
| 50m Butterfly | 29.47 | 2025 Age Group International LC | 2025-06-05 |
| 50m Butterfly | 29.58 | 2025 Age Group International SC | 2025-11-27 |
| 50m Freestyle | 28.21 | 2025 Age Group International LC | 2025-06-05 |
| 50m Freestyle | 26.95 | 2025 Age Group International SC | 2025-11-27 |
| 800m Freestyle | 9:06.06 | MAC Winter Invitational | 2026-01-22 |
| 800m Freestyle | 8:47.88 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
O'Grady, Maximillian's top personal bests include 100m Backstroke (1:06.36), 100m Breaststroke (1:10.20), 100m Breaststroke (1:10.31), 100m Butterfly (1:05.46), 100m Freestyle (57.77).
O'Grady, Maximillian swims for Lakeshore Swim Club.
O'Grady, Maximillian has competed in 7 meets.